Printing-element holder



W. S. WARNOCK.

"PRINTING ELEMENT HOLDER.

APPLICATION FILED NOV. 5, 1921.

1,406,787. Patented Feb.14, 1922.

y/Z 9 4 5g WALLACE S. WARNOGK, OF CHICAGO, ILLINOIS.

PRINTING-ELEMENT HOLDER.

Specification of Letters Patent. Patented Feb; 14, 1922,

Application filed November 5, 1821. Serial No. 512,983.

To all w/wmc'tmay concern Be it known that I, ALL-ion S-.-lVAnNooK,

citizen of the United States, residing at Chicago, in the county of Cook and State oflllinois', have invented a certain new and useful Improvement in Printing-Element Holders, of which the following is a full, clear, concise, and exact description.

My invention relates to printing element holders, commonly termed printing plate holders, and has for its general object the provision of simplified mechanism entering into the construction of the holder so that the holding jaw thereof may readily be applied to a plate or other printing element to be clamped thereby.

In practicing my invention I employ a hollow carrier, a clamping jaw upon the carrier and having a stem within and in pivotal connection with the carrier, an arcuate rack within the carrier and substantially co-axial'with the jaw stem, and operating gearing upon and travelling with the clamping jaw and co-acting with said rack to effect travel of the jaw.

In the preferred embodiment of the invention the stem of the jaw is bifurcated and there are two arcuate racks between which the jaw stem is mounted to move. The gearing that travels with the jaw and cooperates with the rack to effect movement of the jaw is preferably inclusive of two coaxial pinions in mesh with the racks, a gear between and mechaniailly connecting the pinions and co-axial therewith and a worm screw in mesh with the gear and accessible for operation through the aw.

I will explain my invention more fully by reference to the accompanying drawing showing the preferred embodiment thereof and in which Fig. l is a vertical sectional .view, on a large scale, of a printing plate holder constructed in accordance with the invention and a portion of a printing plate foundation that receives the holder; Fig. 2 is a sectional view on line 2-2 of F in. 1 minus the printing plate foundation; Fig. 3 is a sectional view 011 line 3-3 of Fig. 1 also minus the printing plate foundation; and Fig. 4c is a plan view showing a por tion of a section of a printing plate foundation with a printing plate holder of my invention assembled therewith.

Like parts are indicated by similar characters of reference throughout the different figures.

The printing bed or foundation may be of any suitable shape, the drawing showmg a section 1. of a flat bed, a number of sections suitably assembled forming the bed. Each of these sections or blocks is formed with a plurality of cylindrical holes in the construction of the bed section illus trated, although it is to be understood that the invention is not to be limited to any particular form of bed nor to the shape of the holes 52 therein. As illustrated, each hole is provided with an annular enlargement 3 below the work supporting face of the bed whereby there is provided in each hole. an annular retaining shoulder 41:.

Carriers 5 are used in suilicient number to i hold the printing plate upon the bed, these carriers supporting the work engaging mechanism that 1s to be descrlbed. The carriers are preferably cylindrical in order that they may be snugly received within the holes within which they are rotatablein order that the work engaging mechanism may be positioned to suit the location of thework that is to be held upon the foundation.

The mechanism is inclusive of an actuating element 6 within the carrier and slidable along the. same, this actuating element having two ears 7 each formed with an'inclined slot 8, the slots being in the same inclined plane and receiving a pin 9 that IS carried by the upright wings 10 of a retaining member 11. Said wings are formed with horizontal elongated slots or openings 12 through which the rod 13, that is within and anchored to the shell, is passed. The actuating element 6 is formed with an opening 14 for the reception of a projection upon a, suitable actuating tool whereby movement of the actuating element may be forced.

\Vhen the actuating element is drawn to 'its outermost position the lower portions of the'slot-s 8 are positioned to receive the pin 9. Said pin, being fixed upon the wings 10. will then force the inward movement nieinber suiliciently into the shell to permit it to clear the bed. lVhen the retaineris thus positioned the actuating element is depressed to cause the upper ends of the slots 8 to receive the pin 9 in which operation the wings 10 are moved outwardly to thrust the retaining member 11 beneath the retain. ing shoulder 41: upon the bed. lVhen the parts thus assembled the plate holding mechanism, now to be described, may be suitably adjusted.

This plate holding mechanism is inclusive of a clamping jaw 1.5 upon the" carrier 5 and having a bifurcated stem 16 within and in. pivotal connection with the carrier, the stem desirably being in pivotal or rotative connection with the rod 13 that is surrounded by the lower end of the stem. Two arouate racks 17 are within the carrier with which they are assembled by means of the rivets 18, the distance preserving sleeves 19 that surround the rivets defining the spaces that intervene between the racks and the carrier. These racks are coaxial with the jaw stem 16 and the pivot rod 13 of said jaw stein. I provide operating gearing upon and traveling with the clamping jaw 15 and co-acting with the racks 17 to effect the travel of the jaw. Said gearing includes two co-axial pinions 20. in mesh with the racks 17, a gear 21 between and mechanically connecting the pinions and co-axial therewith, and a worm screw 22 in mesh with thegear 21 and accessible for operation through the jaw, the common axis of the gear elements 20 and 21 being horizontal and the axis f the worm. screw 22 being vertical or transverse to the direction of travel of the jaw. The upper end of the screw 22 is formed with a continuation 23 that is polygonal in contour, the jaw having an upright passage therethrough that receives not only the screw 22 but also its continuation 23 that is made accessible for engagement therewith by a jaw adjusting tool. The lower end 24 of the screw 22 is journaled in the base of the hook 25, the screw end 2% being of lesser diameter than the screw so that the screw is prevented from dropping and having a head 26 at its lower end. to prevent the screw from rising.

While I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without deand operating hollow carrier; a clamping jaw upon the carrier and having a stern within and in pivotal connectionwith the carrier; an arouate rack within the carrier and substantially co-a-Xial with the aw stem; and operating gearing upon and travelling withthe clamping jaw and co-acting with said rack to eitect travel of the jaw, said gearing including a pinion in mesh with the rack, a

.gear coupledwith the pinion-and a worm screw in mesh with the gear and accessible for operation through the jaw.

3. A printing element holder including a hollow carrier; a clampingjaw upon the carrier and having a bifurcated stein within and in pivotal connection with the carrier; two arcuate racks within thecarrier and substantially CO-&Xl21l with thebiturcated jaw stern that is disposed between the racks; and operating gearing. upon and traveling with the clamping jaw and co-acting with said racks to effect travel of the jaw.

4. A printing element holder including a hollow carrier; a clamping jaw upon the carrier and having a bifurcated stem within and in pivotal connection with the carrier; two arcuate racks within the carrier and substantially co-axial with the bifurcated jaw stem that is disposed between the racks; gearing upon and traveling with the clamping jaw and. (to-acting with said racks to effect travel ot'the jaw, said gearing including two co-aXial pinions in mesh with the racks, a gear between and mechanically connecting the 'pinions and coaxial therewith and a worm screw in mesh with the gear and accessible for operation through the jaw. i I

In witness whereof, I hereunto subscribe my name this 2nd day of November, A. D,

WALLACE S. /VARNOGK. 

